Question

Dinosaurs were dominant features during the period of

• A. Jurassic
• B. Cretaceous
• C. Triassic
• D. Palaeocene

Answer 1

The correct option is A Jurassic

Mesozoic era (from 230 million years ago to 63 million yrs ago) is the era of medieval life and includes three periods namely, Triassic (225 million years), Jurassic (180 million years) and Cretaceous (135 million years). It is also known as age of gymnosperms or age of reptiles. Triassic era is marked by appearance of first dinosaurs and mammals. The dinosaurs were small in size. Pangaea started to break up in this period. Jurassic period is marked by diversification of dinosaurs, large dinosaurs dominated the earth. There was continuous separation of continents. Cretaceous period is marked by appearance of archaic modern mammals, modern birds and teleost fishes as well as extinction of giant reptiles and toothed birds. The asteroid impact caused mass extinction of dinosaurs thereby eliminating them. Palaeocene epoch (65.5-55.8 million years ago) of Phanerozoic era is marked by rise of placental mammals and evolution of modern birds.

Therefore, the correct answer is option A.